That is the comparison that would be interesting: image from in camera 1600 underexposed two stops and pushed 2 stops in post processing vs. image in camera exposed at 6400.

Hi Maljo,

Two stops is child's play Here are two threads with examples you may be interested in, both pushing 6 stops or so. The first is an 'e', the second is a D7k, which supposedly uses a sensel very similar to the D800's.